Stoichiometry and Percent Yield

Your percent yield is 80%. The actual amount of product produced was 29.1 grams. What is the theoretical yield?

• 25.2 grams

• 37.3 grams

• 37.1 grams

• 36.3 grams

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%

• 0.82%

• 10.1 %

• 100%

What is a limiting reagent?

• any reactant used up first in a reaction.

• any reactant left over at the end of a reaction.

• the maximum amount of product formed from a given amount of reactant.

• the purity of the reactant.

Which reactant is the limiting reagent and why?
2H₂(g) + O₂(g)  → 2H₂O(l)

• Hydrogen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

• Oxygen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

Tags

NGSS.HS-PS1-7

FeBr₂ + 2 KCl → FeCl₂ + 2 KBr 
b)  What is my percent yield of iron (II) chloride if I started with 34 grams of iron(II) bromide and my actual yield is 4 grams?

• 20%

• 28%

• 13%

• 17%

Tags

NGSS.HS-PS1-7

If 5.2 grams of Mn(SO₄)₂ are actually formed in the lab, what is the percent yield?

The calculated number of grams for Mn(SO₄)₂ is 6.30 grams

• 37%

• 48%

• 53%

• 83%

Tags

NGSS.HS-PS1-7

If 10.5g of Na₃N is decomposed, calculate the theoretical mass of sodium that should be produced. If only 2.84g of sodium is actually collected, what is the percent yield?

2Na₃N → 6Na + N₂

• 77%

• 65%

• 33%

• 54%

Tags

NGSS.HS-PS1-7

In the balanced reaction below, 9.8 g of benzene, C₆H_6, reacts with excess HNO₃ resulting in 1.0 g of H₂O. What is the percentage yield?

Molar mass (g/mol): C₆H₆ = 78 HNO₃= 63 C₆H₅NO₂= 123 H₂O = 18

C₆H₆ + HNO₃ → C₆H₅NO₂ + H₂O

• 22%

• 44%

• 12%

• 85%

Tags

NGSS.HS-PS1-7

CH₄  +  2O₂  →  CO₂  +  2H₂O
24 grams of CH₄ was added to the above reaction. Calculate the theoretical yield of CO₂.

• 66 grams

• 132 grams

• 33 grams

• 8.72

Tags

NGSS.HS-PS1-7

When reacting Na with Cl₂, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?

• 100%

• 104%

• 96%

• 1.04

Tags

NGSS.HS-PS1-7